Water-tube boiler.



O. A. PARSONS & S. S; COOK.

WATER TUBE BOILER.

APPLlcAnoN FILED APR. 1o. 1913.

1,210,976. Patented Jan. 2, 1917.

25u/712757317 @im CZazrZq' ernon Par-wom CHARLES ALGEBNON BABSONS, k0F NEWCASTLE-UPON-TBYNE, AND STANLEY SMITH (100K, 0F WALLSEND, ENGLAND; SAID COOK ASSIGNOR T0 SAID PARSONS.

wA'rEnf'rUBE BoILEn.

Specification of Lettersl Patent.

' Patented Jan. 2, 1917.

Application led April 10, 1913. Seal No.y 760,287.

To all whom it may concern:

castle-upon-Tyne, in the county of Nonl thumberland, England, and STANLEY SMITH Coon, of Turbinia Works, Wallsend-on-v Tyne,- in the county of Northumberland, England, subjects of the King of Great Britain and Ireland, have invented certain new and useful Improvements in and Relat# ing to Water-Tube Boilers, of which the following is a specification.

This invention relates to improvements. in water tube boilers and more particularly to super-heating means therefor. Such means usually consist of additional tubes which are exposed to lthe iiames and hot gases of combustion,- and through which the steam.

passes after leaving the steam drum.

The object of the present invention is to avoid the excessive Yheating of these tubes when for any reason such asia reduction of power orf the sudden shutting down of the engines, `the flow of steam through them is reduced or stopped alto ether, while under normal conditions an e cient superheat is obtained.

The invention consistsin a water tube boiler having superheater tubes arranged in single rows intermeshed with some orall o the Vwater heating tubes in close proximity thereto, so that the mutual heat radiation between these superheater and water tubes shall prevent the former from attaining an excessive temperature at such times as the flow of steam therethrough is reducedor stopped.

The invention also consists in the improved arrangements of the water heating means and superheater means in -a water tube boiler as hereinafter described.

The invention is shown carried into effect in the accompanying drawing in connection withl a water tubeboiler o a usual con- .struction having a steam drum, a, connected by means of water tubes, b, to two lower waiter drums, c,.between which the fire grate is'arranged. On the left hand side of the' g ligure are shown additional tubes, d, con- 50 necting the steam drum, a, with a chamber e, within the lower drum, c, these additional tubes being provided for the purpose of preheating the boiler feed water before 1t is passed into the drums, c, and evaporated in the water tubes, b.

The necessary degree of superheat is imparted to the steam by passing the sme from the steam drum, a, through a series of superheating tubes, f,l arranged in single rows and transversely to the tubes, b. The superheating tubes f, it will be seen are intermeshed entirely with the tubes, b, as

shown on the right hand side of the ligure,

or partly with the tubes, b, and partly with the tubes, d, as shown on the left hand side. The tubes, f, are not only intermeshed ,with the tubes, b and d, but are arranged in close proximity thereto, ,an arrangement rendered possible by their disposition in single rows, and in this way the mutual heat radiation between the tubes prevents the superheating tubes, f, from attaining an excessive temperature when the flow of steam through them is diminished or entirely discontinued. Under normal conditions lof workin this mutual radiation in no way diminis es the efficiency of any of the tubes, b, d or f, but on the reduction of power or shutting down of the plant which is supplied with steam by the boiler, the radiation between the superheating tubes, f, and the water-containing tubes, b and d, will be paramount in determining the temperature of the superheating tubes.

f It will be observed that an escape space is rovided about midway the height of the boiler between upper and lower groups of superheater This spacel lies outside of the bank of closely spaced Water tubes and gases after 'impinging against these water tubes and giving up heat thereto will escape through this space. Escape spaces are also provided between the superheater tubes and the water drums, these spaces will modify the lateral passage .of the gases and their action on the superheater tubes to secure the proper heating effect.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what weclaim is l. In a water tube boiler of A form having aA steam drumand two water drums all arranged triangularly with their axes substantially horizontal and rows of upwardly convergent straight water' tubes extending between the water drums and -the drum, and with the re space between the con vergent water tubes, which are closely spaced apart adjacent the iire space, the

combination 'therewith of: a plurality of rows of superheater tubes in single layers intermeshed with single layers of water tubes out beyond the closely wspacedwwate'r tubes, the superheater tubes of each row be.

ing axially vparallel with"v the `axes of the drums and spaced apart for the passageof the hot -gases laterally between them at different heights as received between `the water tubes at different levels, and located in close proximity to the water tubes for the transfer of heat to the latter, said superheater tubes being arranged in groups with spaces between the groups for the escape of the hot gases laterally of the tubes, said lateral escape spaces lying toward the outside of and at a point intermediate the length of the bank of closely spaced water tubes and parallel with the axes of ,thel drums, substan- Atially asldescribed.

2. In combination in a water tube boiler, a steam drum,two water drums all arranged l triangularly and with their axes substantially horizontal, rows of straight waterheating tubes disposed withtheir axes substantially at right angles to the axes of said v drums and connecting said water drums to said steam drum, a plurality of rows of superheating tubes disposed with their axes substantially parallel tothe axes of said drums and lying transversely of vsaid. water tubes in single rows between single rows of said rows of` water tubes,and in suliiciently close proximity thereto for transfer of heat from the superheater tubes to the water ti1besV chambers within said water drums to which the feed water is directly fed, straight feed l water heating tubes disposed rwith their axes substantially parallel to the axes of sald water tubes connecting said chambers with said steam drum, and further superheating tubes disposed in single layersvbetween said straight feed heating tubes and said water tubes and with their axes substantially at right angles to said feed heating and said water tubes, and in suiciently close proximity thereto for ltransfer of heat from the superheater tubes to the water tubes.

3. In combination in a water tube boiler, a steam drum, two water drums all arranged triangularly and with their 'axes' substantially horizontal, rows of straight waterheating l tubes disposed withitheir .axes substantially at right angles to the'` axes of said drums and .connecting said water drums to superheating tubes disposed'withjft'heir axes substantially parallel 'to the axes of said 'drums and lying transversely ofsaid water tubes in single rows between single rows of said rows of water tubes, and in sufficiently close proximity thereto for transfer of heat from the superheater tubesfto the water tubes, vchambers within said water drums to.

which the feed water is directly fed, 'straight' feed water heating tubes disposed with their axes `substantially vparallel to theaxes of said water tubes connectin said chambers with said steam drum, an heating tubes disposed in single layers between said straight feed heating tubes and said water tubes and with their axes substantially at right-angles to said feed heating and said water tubes, and in suiiciently close proximity thereto for transfer of heat from the superheater tubes to the said feed and water tubes, the'whole of 'said super-l widely spaced and two groups of Superheater tubes arranged at each lside of the boiler and toward the outer side of the water tubes and in single layers between sin- 1 gle layers of widely separated water tubes,

said groups of superheater tubes having escape spaces for the gases between them and having also escapespaces between said superheater tubes and the upper and lower drums, substantially as described.

In testimony whereof we aiiix our signatures in presence oftwo witnesses. l

' CHARLES ALGERNON PARSONS.

STANLEY SMITH 000K. Witnees:

FREDERICK GORDON HAY BEDFORD, t ALBERTWILLIAM FARR.

further super- 55. saidsteam drum, a plurality offro'ws of 

